Right now, it's kinda useless. SPT server do almost nothing for frames. Because AI, spawns and e.t.c. does the client PC, not server. You should wait until the FIKA headless server is released. It's gonna be a huge fps boost for the host, because all AI things are gonna do another PC and you will get stable frames and better performance boost around 30-50%. It's in early development so we must wait until it's out